Add new feature note

tfpf · tfpf · commit 3caa19a431b0 · 2026-04-12T16:59:42.000+05:30
diff --git a/doc/release/next_whats_new/underline-23616.rst b/doc/release/next_whats_new/underline-23616.rst
@@ -0,0 +1,12 @@
+Underlining text while using Mathtext
+-------------------------------------
+
+Mathtext now supports the ``\underline`` command.
+
+.. code-block:: python
+
+    import matplotlib.pyplot as plt
+
+    plt.text(0.4, 0.7, r'This is $\underline{underlined}$ text.')
+    plt.text(0.4, 0.3, r'So is $\underline{\mathrm{this}}$.')
+    plt.show()
